Hi olsen,
I made my own “Track to” node some time ago. I was trying to replicate the “Track to Actuator” in BGE.
It is basically the same math formula you made with nodes, but coded in haxe into one node, and with an “UP axis” constraint, or kinda.
If you want to try it, you can check the “looking at” node with a camera! topic.
There is the download link on the last post.